Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Miniature telephoto lens assembly

a miniature telephoto lens and lens assembly technology, applied in the field of miniature telephoto lens assembly, can solve the problems of insufficient ttl/efl (effective focal length ratio) and insufficient conventional lens assembly comprising four lens elements for good quality imaging in such devices, and achieve the effects of reducing chromatic aberration, reducing ttl of lens system, and negatively affecting lens manufacturability and quality

Active Publication Date: 2019-06-18
COREPHOTONICS
View PDF152 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to an optical lens assembly that reduces chromatic aberration and has a favorable ratio of the total length of the lens system to the effective focal length (TTL / EFL<1.0 and minimal chromatic aberration). The design of the first lens element with positive refractive power and the combined design of the first, second, and third lens elements help achieve these technical effects. Additionally, the relatively large distance between the third and fourth lens elements and the combined design of the fourth and fifth lens elements assist in bringing all fields' focal points to the image plane and minimizing chromatic aberration.

Problems solved by technology

Conventional lens assemblies comprising four lens elements are no longer sufficient for good quality imaging in such devices.
However, the design in U.S. Pat. No. 8,395,851 suffers from at least the fact that the TTL / EFL (effective focal length) ratio is too large.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Miniature telephoto lens assembly
  • Miniature telephoto lens assembly
  • Miniature telephoto lens assembly

Examples

Experimental program
Comparison scheme
Effect test

embodiment 100

[0021]In embodiment 100, all lens element surfaces are aspheric. Detailed optical data is given in Table 1, and the aspheric surface data is given in Table 2, wherein the units of the radius of curvature (R), lens element thickness and / or distances between elements along the optical axis and diameter are expressed in mm. “Nd” is the refraction index. The equation of the aspheric surface profiles is expressed by:

[0022]z=cr21+1-(1+k)⁢c2⁢r2+α1⁢r2+α2⁢r4+α3⁢r6+α4⁢r8+α5⁢r10+α6⁢r12+α7⁢r14

where r is distance from (and perpendicular to) the optical axis, k is the conic coefficient, c=1 / R where R is the radius of curvature, and a are coefficients given in Table 2. In the equation above as applied to embodiments of a lens assembly disclosed herein, coefficients α1 and α7 are zero. Note that the maximum value of r “max r”=Diameter / 2. Also note that Table 1 (and in Tables 3 and 5 below), the distances between various elements (and / or surfaces) are marked “Lmn” (where m refers to the lens element...

embodiment 200

Embodiment 200 provides a FOV of 43.48 degrees, with EFL=7 mm, F#=2.86 and TTL=5.90 mm. Thus and advantageously, the ratio TTL / EFL=0.843. Advantageously, the Abbe number of the first, third and fifth lens elements is 56.18. The first air gap between lens elements 202 and 204 has a thickness (0.129 mm) which is about half the thickness d2 (0.251 mm). Advantageously, the Abbe number of the second lens element is 20.65 and of the fourth lens element is 23.35. Advantageously, the third air gap between lens elements 206 and 208 has a thickness (1.766 mm) greater than TTL / 5 (5.904 / 5 mm). Advantageously, the fourth air gap between lens elements 208 and 210 has a thickness (0.106 mm) which is less than 1.5×d5 (0.495 mm).

[0031]The focal length (in mm) of each lens element in embodiment 200 is as follows: f1=2.851, f2=−5.468, f3=−10.279, f4=7.368 and f5=−4.536. The condition 1.2×|f3|>|f2|5.468>1.5×2.851. f1 also fulfills the condition f1

[0032]Using the data from row #2 ...

embodiment 300

[0034]In embodiment 300, all lens element surfaces are aspheric. Detailed optical data is given in Table 5, and the aspheric surface data is given in Table 6, wherein the markings and units are the same as in, respectively, Tables 1 and 2. The equation of the aspheric surface profiles is the same as for embodiments 100 and 200.

[0035]

TABLE 5Radius RDistancesDiameter#Comment[mm][mm]Nd / Vd[mm]1StopInfinite−0.382.42L111.51270.9191.5148 / 63.12.53L12−13.38310.0292.34L218.44110.2541.63549 / 23.912.15L222.61810.4261.86L31−17.96180.265 1.5345 / 57.091.87L324.58411.9981.78L41−2.88270.5141.63549 / 23.913.49L42−1.97710.1213.710L51−1.86650.431 1.5345 / 57.094.011L52−6.36700.5384.412WindowInfinite0.210 1.5168 / 64.173.013Infinite0.2003.0

[0036]

TABLE 6Conic#coefficient kα2α3α4α5α62−0.5341.3253E−022.3699E−02−2.8501E−021.7853E−02−4.0314E−033−13.4733.0077E−024.7972E−031.4475E−02−1.8490E−024.3565E−034−10.1327.0372E−041.1328E−011.2346E−03−4.2655E−028.8625E−0355.180−1.9210E−032.3799E−01−8.8055E−022.1447E−01−1.2702E−...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
focal length f1aaaaaaaaaa
Abbe numberaaaaaaaaaa
Abbe numberaaaaaaaaaa
Login to View More

Abstract

An optical lens assembly includes five lens elements and provides a TTL / EFL<1.0. In an embodiment, the focal length of the first lens element f1<TTL / 2, an air gap between first and second lens elements is smaller than half the second lens element thickness, an air gap between the third and fourth lens elements is greater than TTL / 5 and an air gap between the fourth and fifth lens elements is smaller than about 1.5 times the fifth lens element thickness. All lens elements may be aspheric.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation application of U.S. patent application Ser. No. 15 / 418,925 filed Jan. 30, 2017, now U.S. Pat. No. 9,857,568, which was a Continuation in Part application of U.S. patent application Ser. No. 15 / 170,472 filed Jun. 1, 2016, now U.S. Pat. No. 9,568,712, which was a Continuation application of U.S. patent application Ser. No. 14 / 932,319 filed Nov. 4, 2015, now U.S. Pat. No. 9,402,032, which was a Continuation application of U.S. patent application Ser. No. 14 / 367,924 filed Jun. 22, 2014, now abandoned, which was a 371 Continuation application of international application PCT / IB2014 / 062465 filed Jun. 20, 2014, and is related to and claims priority from U.S. Provisional Patent Application No. 61 / 842,987 filed Jul. 4, 2013, which is incorporated herein by reference in its entirety.FIELD[0002]Embodiments disclosed herein relate to an optical lens system and lens assembly, and more particularly, to a miniature tel...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): G02B13/00G02B27/00G02B1/04G02B13/02G02B9/60G02B27/64G02B9/00G02B5/00H04N101/00
CPCG02B13/0045G02B1/041G02B9/60G02B13/02G02B27/0025G02B27/646G02B5/005G02B9/00G02B13/002H04N2101/00H04N2201/00Y10T29/4913
Inventor DROR, MICHAELGOLDENBERG, EPHRAIMSHABTAY, GAL
Owner COREPHOTONICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com